Muhammad Hosni Sayyid Mubarak (Arabic: محمد حسني سيد مبارك‎, Egyptian Arabic pronunciation: , Muḥammad Ḥusnī Sayyid Mubārak; born 4 May 1928) is a former Egyptian politician and military commander. He served as the fourth President of Egypt from 1981 to 2011.

Mubarak was appointed Vice President of Egypt in 1975, and assumed the presidency on 14 October 1981, following the assassination of President Anwar El Sadat. The length of his presidency made him Egypt's longest-serving ruler since Muhammad Ali Pasha. Before he entered politics, Mubarak was a career officer in the Egyptian Air Force, serving as its commander from 1972 to 1975 and rising to the rank of air chief marshal.

Mubarak was ousted after 18 days of demonstrations during the 2011 Egyptian revolution when, on 11 February, Vice President Omar Suleiman announced that Mubarak had resigned as president and transferred authority to the Supreme Council of the Armed Forces. On 13 April, a prosecutor ordered Mubarak and both his sons to be detained for 15 days of questioning about allegations of corruption and abuse of power. He was then ordered to stand trial on charges of premeditated murder of peaceful protestors during the revolution. These trials officially began on the 3 August 2011. Egypt’s military prosecutors then also proclaimed that it is investigating Mubarak's role in the assassination of his predecessor Anwar Sadat.

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